Grandfathering

What is grandfather rule?

A community will occasionally make structural improvements (dams, levees, etc.) to
reduce the potential effects of flooding; experience new development aggravating
the flooding situation, thereby expanding the floodplain; revise geographical
boundaries resulting in the designation of additional flood hazard areas; or
provide information to better delineate the Base Flood Elevation (BFE) and/or
flood insurance risk zones. When these situations occur, the Flood Insurance
Rate Map (FIRM) is revised and republished.

The implementation of a new FIRM raises the question-- HOW DOES THE NEW MAP AFFECT FLOOD INSURANCE RATES?

To recognize policyholders who have remained loyal customers of the NFIP by
maintaining continuous coverage and/or who have built in compliance with the
FIRM, the Federal Insurance and Mitigation Administration has "Grandfather
rules" to allow such policyholders to benefit in the rating for that building.

Pre-FIRM (construction prior to the date of the community's initial FIRM)
1. If a policy was obtained prior to the effective date of a map change, the
policyholder is eligible to maintain the prior zone and base flood elevation as
long as continuous coverage is maintained. The policy can be assigned to a new
owner at the option of the policyholder.
2. If a building is Pre-FIRM and a policy was not obtained prior to the effective date of a map change, the applicant is eligible to receive the Pre-FIRM (subsidized) rates based on the new zone rather than the actuarial (elevation based) rates.

Post-FIRM (construction on or after the date of the community's initial FIRM)
1. If a policy was obtained prior to the effective date of a map change, the
policyholder is eligible to maintain the prior zone and base flood elevation as
long as continuous coverage is maintained. The policy can be assigned to a new
owner at the option of the policyholder.
2. If a building was constructed in compliance with a specific FIRM, the owner is always eligible to obtain a policy using the zone and base flood elevation from that FIRM, provided that proof (refer to the Flood Insurance Manual, Rating section for acceptable
documentation) is submitted to the insurance company. Continuous coverage is not
required. Preferred Risk Policies 1. Buildings written on Preferred Risk
Policies are required to be located in zones B, C, or X on the FIRM in effect on
the date of application and on the date of each subsequent renewal. 2. A
building, which becomes ineligible for a Preferred Risk Policy due to a map
change to a special flood hazard area, can be rewritten on a standard rated
policy using zones B, C, or X.